WiringPi Frequency Test Program

/*
 * frequency-test.c:
 *      Simple test program to mearure GPIO update frequency
 */

#include <wiringPi.h>

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>

int main (void)
{
  printf ("Raspberry Pi Frequency test program\n") ;

  if (wiringPiSetup () == -1)
    exit (1) ;

  pinMode (1, OUTPUT) ;

  for (;;)
  {
    digitalWrite(1,1);
    digitalWrite(1,0);
  }

  return 0 ;
}